<!DOCTYPE html>

<head>
    <meta charset="UTF-8">
    <title>CSS 开关样式</title>
    <style>
        .switch {
            position: relative;
            display: inline-block;
            width: 60px;
            height: 34px;
        }

        .switch input {
            display: none;
        }

        .slider {
            position: absolute;
            cursor: pointer;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: #ccc;
            -webkit-transition: .4s;
            transition: .4s;
        }

        .slider:before {
            position: absolute;
            content: "";
            height: 26px;
            width: 26px;
            left: 4px;
            bottom: 4px;
            background-color: white;
            -webkit-transition: .4s;
            transition: .4s;
        }

        input:checked+.slider {
            background-color: #2196F3;
        }

        input:focus+.slider {
            box-shadow: 0 0 1px #2196F3;
        }

        input:checked+.slider:before {
            -webkit-transform: translateX(26px);
            -ms-transform: translateX(26px);
            transform: translateX(26px);
        }

        /* Rounded sliders */
        .slider.round {
            border-radius: 34px;
        }

        .slider.round:before {
            border-radius: 50%;
        }
    </style>
</head>

<body>
    <h2>开关切换</h2>

    <label class="switch">
        <input type="checkbox">
        <div class="slider"></div>
    </label>

    <label class="switch">
        <input type="checkbox" checked>
        <div class="slider"></div>
    </label><br><br>

    <label class="switch">
        <input type="checkbox">
        <div class="slider round"></div>
    </label>

    <label class="switch">
        <input type="checkbox" checked>
        <div class="slider round"></div>
    </label>
</body>

</html>